This letter (which I have seen before) is generic, being too loosely
interpreted and is really only relevant to the blanket application of
new materials like SAC305, bismuth, palladium, lead finishes and
component materials.
Many current systems (including flight hardware and aircraft systems)
procured by both the Airforce and NASA include Sn96 solder joints within
and those were designed in and never have been considered a reliability
issue.
If this letter were to be taken literally, the US would be grounding
ICBMs, numerous aircraft/ submarine communication systems and more. Also
we would have never gotten into space, and should also expect more
satellites fail.
I learned of the tin/ steel corrosion issues with wave solder machine
pot metals in 1984/85 time-frame while using Sn96 regularly on some
selected Airforce products.
The Airforce and Navy inspectors were on site, knew exactly what we were
doing, approved all drawings and inspected the products.
So to say there is no reliability data makes me wonder....
Rick Smith
Senior Product/ Component Engineer
Phone: (512)652-3544
Fax: (512)652-3545
Cell: (512)299-6925
Email: [log in to unmask]
ClearCube Technology, Inc
8834 Capital of Texas Hwy N
Austin, TX 78759
www.clearcube.com
-----Original Message-----
From: Leadfree [mailto:[log in to unmask]] On Behalf Of John Burke
Sent: Thursday, August 04, 2005 11:55 PM
To: [log in to unmask]
Subject: Re: [LF] 96.5% Tin / 3.5% Silver vs. SAC305
Actually it was meant EXACTLY in the context quoted, it meant exactly
what
it said,
I have attached it for reference.
John........................8-)
------------------------------------
Avanex
John Burke
Senior Manager RoHS Compliance
[log in to unmask]
40919 Encyclopedia Circle
Fremont
CA 94538
tel: 510 897 4250
fax: 510 979 0189
mobile: 510 676 6312
------------------------------------
-----Original Message-----
From: Leadfree [mailto:[log in to unmask]]On Behalf Of MA/NY DDave
Sent: Thursday, August 04, 2005 9:03 PM
To: [log in to unmask]
Subject: Re: [LF] 96.5% Tin / 3.5% Silver vs. SAC305
Hi John, CA-JoeFj, , , IPC LF Listservers,
<==== CA-Joe's or Joe9000's note====>
"To date, no lead-free solders are known to have met the reliability
requirements imposed upon military electronics. "
that sentence is highly charged...
<=========
That Air Force Document that we received via this Listserve (via I think
someone out of Cedar Rapids) really is focussed on a mixed set of 2nd
level, and beyond, assembly products used by the AirForce (components to
cards or boards). Lead Free Solders are used by the military as the
technical need arises and within components for their properties.
We have to read this USAF document in the context intended.
Yours in Engineering, Dave
YiEngr, MA/NY DDave
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To unsubscribe, send a message to [log in to unmask] with following text in
the BODY (NOT the subject field): SIGNOFF Leadfree
To temporarily stop/(start) delivery of Leadree for vacation breaks send: SET Leadfree NOMAIL/(MAIL)
Search previous postings at: http://listserv.ipc.org/archives
Please visit IPC web site http://www.ipc.org/contentpage.asp?Pageid=4.3.16 for additional information, or contact Keach Sasamori at [log in to unmask] or 847-615-7100 ext.2815
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